Enabling WDS on 2x WRT54G

Okay, I have two WRT54G routers and want to set them up in WDS mode to act as a cheap wireless hookup for my Xbox 360.

I heard somewhere that the new standard Linksys firmware for these routers actually automatically implements WDS when the wireless SSID, channel and encryption are the same between both models.

I was just wondering if this is indeed true, or if I need to install some third party firmware to get this functionality. Because I've had no luck yet trying to get WDS working with the latest Linksys firmware.